Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications

Figure 9

(a) Measured and (b) simulated 3D radiation patterns for the four-element MIMO antenna in free space (at 5.5 GHz). (c) Measured 2D radiation patterns (at 5.5 GHz).

(a)

(b)

(c)